Lieutenant Marlena Moreau was a scientist serving aboard the ISS Enterprise in 2267. She was also James T. Kirk's captain's woman.

When she saw her captain show mercy to Spock by allowing McCoy to treat him for injuries suffered in a fight with Kirk, Moreau deduced that Kirk was in fact not her own captain, but instead a counterpart from a mirror universe. She used the Tantalus field to save Kirk from an assassination attempt by Sulu. She eliminated Sulu's henchmen from existence with the field. At first she wanted to go with Kirk back to the other universe, but the transporter was set for only four people. Along with Spock, she helped Kirk and his crew escape from the Enterprise before they could be discovered and killed. (TOS: "Mirror, Mirror")

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